Question

(Word limit 200) Briefly describe the differences that exist between the cell wall structure in Gram-positive and Gram-negative bacteria. What external bacterial structures are associated with the cell wall?

Answer 1

Difference between gram positive and gram negative bacteria has been described below

	Gram positive bacteria	gram gram negative bacteria
	These has thick and multi layered peptido glycane layer	thin peptide glycan layer
	Ce wall us 20- 80 nm thick	Cell wall is around 5- 10nm thick
	Cell wall is smooth	Cell wall is waxy
	Periplasmic space is absent	periplasmic space is present
	It contains outer membrane	do not contain outer membrane
	Contain techoic acid in the cell wall which provide stability	techoic acid is absent
	Lipid and lipoproteins content is low in cell wall	has high lipid and lipoproteins content
	Retain gram staining during staining procedure , appear purple colour	do not retain gram stain , appear pink colour due to retain counter stain
	Example clostridium, streptococcus	example- acetobactor, enterobactor